04-17-2009, 11:12 PM
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CC Member
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Join Date: May 2002
Location: Ashburton, New Zealand,
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Cobra Make, Engine: UK Ram SC. KC-Yates 373, Jerico 5 speed.
Posts: 1,240
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Not Ranked
Muffler replacement huge horsepower gains!
Why do some guys go to 3.5" internal perf tube or is that for eg 800hp over 7litre engines?
When we dynoed this 373 engine with smaller port inlet to suit the C3 heads we only lost 1bhp over the big manifold at 7000rpm, going by the dyno found there is no real point in going over 6800rpm, all this was done straight out of the tapered collector of 3" diameter going into the typical large silver 6 or 8" flexible ducting hoses so I dont know if going bigger than 3" internal mufflers would achieve much. Going by all the information on CC etc and my rpms it appears that 3" for my 600+hp engine would be adequate.
We have a 200bhp increase from 4000 - 5000 @ 520bhp I dont think I need anymore low to mid range hp by keeping my muffler size down.as its going to be hard to get this beast to hook up due to the lightweight I emagine we are still a liong way off having it mobile!
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A J. Newton
The 1960's rocked!
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